###############################################################################
#
# Copyright 2009, Sri Panyam
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
###############################################################################

from twisted.web import error as twerror
import errors

def get_reqvar(request, param, defaultval = None):
    """
    Returns a GET parameter in a request.
    If the parameter was not found then the defaultval is returned.
    """
    if param in request.args:
        return request.args[param][0]
    return defaultval

